Perhaps she wouldn't have to lie if her own parents didn't punish her for every candy she ate?
You really don't realize that the main problem is the people who live with Lena and control her diet, weight, workouts and so on? It's about her parents, not her coaches.
But you want to demonize the coaches. Lena hasn't been training with Tutberidze for many years now, and all the problems remain.
And of course, it will only get worse, because Lena is prone to obesity, just like her mom. At puberty, when all teenagers inevitably gain weight, she is very likely to get an eating disorder, as she will have to fight with every gram of fat and milliliter of water.